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[54.240.197.224]) by smtp.gmail.com with ESMTPSA id c7-20020a05600c0a4700b003c6bbe910fdsm47772268wmq.9.2023.01.16.08.27.16 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 16 Jan 2023 08:27:16 -0800 (PST) From: Paul Durrant X-Google-Original-From: Paul Durrant Message-ID: <21ca1bcc-f2ae-3ba4-5293-8aaa1d40321f@xen.org> Date: Mon, 16 Jan 2023 16:27:14 +0000 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:102.0) Gecko/20100101 Thunderbird/102.6.1 Subject: Re: [PATCH v6 11/51] i386/xen: implement HYPERVISOR_sched_op, SCHEDOP_shutdown Content-Language: en-US To: David Woodhouse , qemu-devel@nongnu.org Cc: Paolo Bonzini , Joao Martins , Ankur Arora , =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= , Thomas Huth , =?UTF-8?Q?Alex_Benn=c3=a9e?= , Juan Quintela , "Dr . David Alan Gilbert" , Claudio Fontana , Julien Grall References: <20230110122042.1562155-1-dwmw2@infradead.org> <20230110122042.1562155-12-dwmw2@infradead.org> Organization: Xen Project In-Reply-To: <20230110122042.1562155-12-dwmw2@infradead.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=2a00:1450:4864:20::32b; envelope-from=xadimgnik@gmail.com; helo=mail-wm1-x32b.google.com X-Spam_score_int: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, NICE_REPLY_A=-0.097, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: paul@xen.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On 10/01/2023 12:20, David Woodhouse wrote: > From: Joao Martins > > It allows to shutdown itself via hypercall with any of the 3 reasons: > 1) self-reboot > 2) shutdown > 3) crash > > Implementing SCHEDOP_shutdown sub op let us handle crashes gracefully rather > than leading to triple faults if it remains unimplemented. > > In addition, the SHUTDOWN_soft_reset reason is used for kexec, to reset > Xen shared pages and other enlightenments and leave a clean slate for the > new kernel without the hypervisor helpfully writing information at > unexpected addresses. > > Signed-off-by: Joao Martins > [dwmw2: Ditch sched_op_compat which was never available for HVM guests, > Add SCHEDOP_soft_reset] > Signed-off-by: David Woodhouse Reviewed-by: Paul Durrant